/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Operations/FFDLattice.h
Compute the extrapolated position for a "virtual" lattice control point outside of the actual lattice.
FVector3d ExtrapolatedLatticePosition ( const [FVector3i](API\Runtime\GeometryCore\FVector3i) & VirtualPointIndex, const [TArray](API\Runtime\Core\Containers\TArray)< FVector3d > & LatticeControlPoints ) const